This circuit is from General Electric documentation from 1970. The transistors can be of general-purpose types, except for the power that can be a BD136.
We found this circuit in a publication from the 1970s. It produces intermittent clicks on a...
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit is...
This circuit is from 1977 Radio Shack documentation. The circuit modulates an LED (which can be...